Laboratoire de Glycochimie, des Antimicrobiens
et des Agroressources UMR 7378 CNRS


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Actualités et Publications

Fundamental insight into the interaction between a lithium salt and an inorganic filler for ion mobility using a synergic theoretical-experimental approach,

Bidal, J.; CÉZard, C.; Bouvier, B.; Hadad, C.; Nguyen Van Nhien, A.; Becuwe, M.

J. Colloid Interface Sci. 2022.

The present paper aims at providing a fundamental insight into the interaction between a lithium salt and an inorganic filler in a perspective of lithium mobility. Through a synergistic approach, coupling experimental results and molecular dynamics simulations, the influence of the surface chemical state of the nanosilica Stöber-type on the dissociation of LiTFSI and its impact on the lithium conduction properties are studied. For this purpose, the surface modification of silica nanoparticles was performed by different methods such as calcination, lithiation and capping with organosilane. The impact of the surface modification on the dissociation of the lithium salt is further investigated by electrochemical impedance spectroscopy after impregnation of the material with a defined amount of lithium salt. The combined experimental and in silico analyses of the results, performed for the first time on such systems, allow a detailed understanding of the interaction between the salt and the support and should prove itself useful for the future design of hybrid polymer electrolytes in new generation batteries.

Synthesis, characterization and in vivo antitumor effect of new α,β-unsaturated-2,5-disubstituted-1,3,4-oxadiazoles,

Fray, M.; Elbini-Dhouib, I.; Hamzi, I.; Doghri, R.; Srairi-Abid, N.; Lesur, D.; Benazza, M.; Abidi, R.; Barhoumi-Slimi, T.

Synth. Commun. 2022, 1-12.

AbstractNew α,?-unsaturated-2,5-disubstituted-1,3,4-Oxadiazoles (4a?j) and (10a?d) have been prepared in good to excellent yields starting from ?-chlorovinyl aldehydes and hydrazide. The synthesized oxadiazoles were fully characterized by (1H, 13C) NMR, IR and HRM Sspectroscopic techniques. The in vivo antitumor activity of 4b, 4c, 4g, 4d, and 10c was evaluated. Biochemical measurements of serum alanine aminotransferase, aspartate aminotransferase and creatinine levels of mice injected with a dose of 20?mg/kg, of each selected compound, showed no toxic effect, neither in liver nor in kidney organs. However, hepato/nephrotoxicities were observed in mice treated with a dose of 100?mg/kg. When tested on melanoma in a mice xenograft model, the pharmacodynamic study indicated that the two compounds 4c, bearing a trifluoromethyl group and 10c, bearing a triazole moiety, are potent antitumoral agents at the safe dose of 20?mg/kg against B16-F10-induced melanoma.

Synthesis of novel S- and O-disaccharide analogs of heparan sulfate for heparanase inhibition,

Koffi Teki, D. S. E.; Coulibaly, B.; Bil, A.; Vallin, A.; Lesur, D.; Fanté, B.; Chagnault, V.; Kovensky, J.

Org. Biomol. Chem. 2022.

Heparan sulfate (HS), a glycosaminoglycan related to heparin, is a linear polysaccharide, consisting of repeating disaccharide units. This compound is involved in multiple biological processes such as inflammation, coagulation, angiogenesis and viral infections. Our work focuses on the synthesis of simple HS analogs for the study of structure–activity relationships, with the aim of modulating these biological activities. Thioglycoside analogs, in which the interglycosidic oxygen is replaced by a sulfur atom, are very interesting compounds in terms of therapeutic applications. Indeed, the thioglycosidic bond leads to an improvement of their stability and can allow the inhibition of enzymes involved in physiological and pathological processes. In our previous work, we developed a synthetic sequence which led to a non-sulfated thiodisaccharide analog of HS. In this paper, we report our results of the development of a new synthetic method allowing access to the novel sulfated S-disaccharide, as well as to their oxygenated analogues (O-disaccharide and sulfated O-disaccharide). These 4 compounds were also tested for the inhibition of heparanase, an enzyme involved in biological processes like tumor growth and inflammation. The obtained IC50 values in the micromolar range showed the impact of the interglycosidic sulfur atom and the 6-sulfate group.

Improving the environmental compatibility of enzymatic synthesis of sugar-based surfactants using green reaction media,

Vuillemin, M. E.; Husson, E.; Laclef, S.; Jamali, A.; Lambertyn, V.; Pilard, S.; Cailleu, D.; Sarazin, C.

Process Biochem. (Amsterdam, Neth.) 2022, 117, 30-41.

The enzymatic synthesis of sugar-based surfactants is often performed in non-conventional media that do not meet any longer the current environmental acceptability, especially for biodegradability and cytotoxicity. In this work, we propose innovative sustainable routes by replacing the current reference organic solvent, 2-methyl-2-butanol (2M2B) by either 2-methyltetrahydrofuran (MeTHF), an agrosolvent, or 2-methyltetrahydrofuran-3-one (MeTHF-3-one), a food-grade ingredient used as solvent. These two neoteric solvents were thus evaluated as reaction media via a lipase-catalyzed esterification of glucose by lauric acid and revealed a novel matter of interest. The regioselectivity of the reaction was mainly directed toward the primary alcohol of glucose maintaining the end-product obtained in 2M2B: D-glucose-6-O-laurate. The PLS-Surface Response Design evidenced enzymatic performances in ester production of 48% in MeTHF and 79% in MeTHF-3-one. The latter solvent resulted not only in better yields compared to 2M2B, but also in an increased enzymatic stability, allowing better reuse of the catalyst. MeTHF-3-one has been shown to be readily biodegradable according to OECD standards. Herein, this solvent has been substantiated for the first time as a green medium in an efficient, selective and sustainable enzymatic synthesis of sugar esters.

Heteroglycoclusters through Unprecedented Orthogonal Chemistry Based on N-Alkylation of N-Acylhydrazone,

Fray, M.; Mathiron, D.; Pilard, S.; Lesur, D.; Abidi, R.; Barhoumi-Slimi, T.; Cragg, P. J.; BENAZZA, M.

Eur. J. Org. Chem. 2022

Orthogonal chemistry is a valuable tool in the preparation of complex molecules as heteroglycoclusters. Unfortunately, selective heteroconjugation of multifunctional starting materials remains a usually challenging problem to overcome. Herein, we report the first use of N -alkylation of N -acylhydrazone as a key step in the orthogonal synthesis. Sequentially associated with the azido-alkyne click chemistry, it stands out as a new and straightforward synthetic method of glycoconjugate small molecules, heterodisaccharides, and heteroglycoclusters based on cone p - t Bu-calix[4]arene and 1,3- alt p - t Bu-thiacalix[4]arene with

Metal-free hydroxy and aminocyanation of furanos-3-uloses,

Camara, T. E.; Koffi Teki, D. S.-E.; Chagnault, V.

Carbohydr. Res. 2021, 108486.

TSAO-T and ATSAO-T analogues are molecules of interest that are able to inhibit the reverse transcriptase (RT) of HIV-1 and HCV. We also recently highlighted their antiproliferative properties. In all cases, the spiro cycle was a required group for biological activities, which led chemists to produce many derivatives, especially on this ring. These structures can be accessed through the formation of glycoaminonitriles and glycocyanhydrins using methodologies not always adapted to the synthesis of large quantities. Moreover, these latter are poorly versatile (substrate-dependent), need expensive cyanogenic agents and implies the use of a metal in non-catalytic amounts. For this reason, we report here a new metal-free methodology for the synthesis of glycoaminonitriles and glycocyanhydrins using molecular iodine (I2).

Cyclodextrin Complexation as a Way of Increasing the Aqueous Solublity and Staility of Carvedilol,

Rigaud, S.; Mathiron, D.; Moufawad, T.; Landy, D.; Djedaini-Pilard, F.; Marçon, F.

Pharmaceutics 2021, 13, 1746.

We studied the effect of several CDs on carvedilol’s solubility and chemical stability in various aqueous media. Our present results show that it is possible to achieve a carvedilol concentration of 5 mg/mL (12.3 mM) in the presence of 5 eq of γCD or RAMEB in an aqueous medium with an acceptable acid pH (between 3.5 and 4.7). Carvedilol formed 1:1 inclusion complexes but those with RAMEB appear to be stronger (K = 317 M−1 at 298 K) than that with γCD (K = 225 M−1 at 298 K). The complexation of carvedilol by RAMEB significantly increased the drug’s photochemical stability in aqueous solution. These results might constitute a first step towards the development of a novel oral formulation of carvedilol.

Chemical Evaluation, Antioxidant, Antiproliferative, Anti-Inflammatory and Antibacterial Activities of Organic Extract and Semi-Purified Fractions of the Adriatic Sea Fan, Eunicella cavolini,

Matulja, D.; Grbcic, P.; Bojanic, K.; Topic-Popovic, N.; Coz-Rakovac, R.; Laclef, S.; Smuc, T.; Jovic, O.; Markovic, D.; Pavelic, S. K.

Molecules 2021, 26.

Due to sedentary lifestyle and harsh environmental conditions, gorgonian coral extracts are recognized as a rich source of novel compounds with various biological activities, of interest to the pharmaceutical and cosmetic industries. The presented study aimed to perform chemical screening of organic extracts and semi-purified fractions obtained from the common Adriatic gorgonian, sea fan, Eunicella cavolini (Koch, 1887) and explore its abilities to exert different biological effects in vitro. Qualitative chemical evaluation revealed the presence of several classes of secondary metabolites extended with mass spectrometry analysis and tentative dereplication by using Global Natural Product Social Molecular Networking online platform (GNPS). Furthermore, fractions F4 and F3 showed the highest phenolic (3.28 +/- 0.04 mg GAE/g sample) and carotene (23.11 +/- 2.48 mg beta-CA/g sample) content, respectively. The fraction F3 inhibited 50% of DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) and ABTS (2,2'-azino-bis (3-ethylbenzthiazolin-6-yl) sulfonic acid) radicals at the concentrations of 767.09 +/- 11.57 and 157.16 +/- 10.83 microg/mL, respectively. The highest anti-inflammatory potential was exhibited by F2 (IC50 = 198.70 +/- 28.77 microg/mL) regarding the inhibition of albumin denaturation and F1 (IC50 = 254.49 +/- 49.17 microg/mL) in terms of soybean lipoxygenase inhibition. In addition, the most pronounced antiproliferative effects were observed for all samples (IC50 ranging from 0.82 +/- 0.14-231.18 +/- 46.13 microg/mL) against several carcinoma cell lines, but also towards non-transformed human fibroblasts pointing to a generally cytotoxic effect. In addition, the antibacterial activity was tested by broth microdilution assay against three human pathogenic bacteria: Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus. The latter was the most affected by fractions F2 and F3. Finally, further purification, isolation and characterization of pure compounds from the most active fractions are under investigation.

Laboratoire de Glycochimie, des Antimicrobiens et des Agroressources
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